First, let me say I play 99.9% pizz. I got a Glasser bow for one single song that my current Irish/Pub band is doing and the rest of the time I use it for fencing gestures towards the drummer, etc. With that level of seriousness in mind, I wasn't that picky when I bought some rosin and ended up with Pop's, since that was all the local Sam Ash carried. Fast forward to last month sometime when I noticed the hairs on my bow were all sticking together and turning greyish green. Also the notes weren't coming as easily when I played arco. The fiddle player (who is a real violinist but enjoys Guinness) said that my rosin had maybe gone "bad" and that I might need a rehair and then new good rosin. Paying $75-$100 to rehair a $50 bow obviously doesn't make sense so I'm wondering: - I'm fairly handy, can I rehair a bow myself? Is there a tutorial anywhere? - What caused the issue with the current hair and can that be fixed instead of a rehair? - Are some rosins more prone to this sort of "melting together" effect ? Yeah, I'm a newbie to this so any kind words would be appreciated.